Hi,
'git pull' from the Hardy kernel and LUM trees will not work because
the history was overwritten to reorder some changes for the point
release.
In order to get your local trees into a consistent state carry out the
following step(s):
$ cd ubuntu-hardy
$ git fetch
$ git branch -r (make sure you have a origin/master)
$ git reset --hard origin/master
'git pull' should now work correctly.
Sorry for the inconvenience.
Regards,
Amit